(under subclass 3.21) Device provided with means for causing engagement of the clutch, which means is actuated by force applied via a liquid or gaseous medium.
(1) Note. Many of the patents in this subclass (3.33) disclose the fluid pressure for actuating the clutch to be derived from the toroidal flow of the vortex-flow drive. It is inherent in such disclosures that the clutch engagement is speed responsive.
SEE OR SEARCH THIS CLASS, SUBCLASS:
3.29+, for a fluid-pressure operator to actuate a vortex-flow drive-lockup clutch.
